Sachin here (from Substack). I for one would be stoked about a MacOS app, although it's probably not the highest priority thing right now :)
Our next step within the Apple universe will most likely be to build an amazing iPad optimized experience. Right now the app works on iPad, but it's definitely not as great as it could be. A better iPad app would also be a good starting foundation for MacOS (and work on Silicon macs out the gate).